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(No Model.)

R. G. BROWN.

INSULATOR.

No. 353,120. Patented Nov. 23, 1886.

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UNITED STATES PATENT OFFICE.

ROBERT G. BROWN, OF BROOKLYN, ASSIGNOR TO E. S. GREELEY & 00., OF NEXVYORK, N. Y.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 353,120, dated November23, 1886.

Application filed June 24, 1886. Serial No. 206,061. (No model.)

To all whom it may concern:

Be it known that I, ROBERT G. BROWN, of Brooklyn, county of Kings, Stateof New York, and a citizen of the United States, have invented anImproved Insulator for Telegraph and Analogous Line-\Vires, of which thefoland with the wall ofthe opening screw-threaded throughout its entirelength, as hereinafter particularlyset forth, whereby an insulator isconstructed which is particularly adapted for use upon the under orlower side of a erossarln or similar support.

In the drawing is shown a central longitudinal sectional View of aninsulator containing my invention, the pin or support, to which it isespecially adapted to be secured on the lower side ofa crossarin,heingshownin brokenlines.

A. is the insulator, which is formed of glass or other non-conductingmaterial. The insulator is provided with the usual exteriorcircumferential groove, (1., for seating or attaching to the insulatorthe linewire to be hung thereon.

At a is an opening which extends centrally longitudinally of theinsulator, and entirely through it from top to bottom. The wallof thisopening is screw-threaded throughout its length, as shown. Thisinsulator is especially ada ted to be screwed upon a )in or supportextending from the lower or under side of a cross-arm on atelegraph-pole or other such support, the pin entering theopening at therounded or convex top a of the insulator, and

engaging the thread on the wall of the openl i- The opening a. isdesirably somewhat flaring from its lower end toward the top, so as tofit upon the sustaining-pin, which is usually tapered at its threadedportion.

It is evident that when this insulator is screwed upon thedowm'ardly-projecting pin which is to sustain it upon the cross arm orsnpportas, for instance, upon a telegraphpole-any moisture, as fromrain, which may fall upon the rounded or convex top a will readily flowoff, and that. in case any moisture should tind entrance into theopening a about the pin its tendency will he to pass downward and flowout or escape through the bottom or lower end of the opening.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is

The described insulator for hanging linewires, having the convex orsloping top end, a", and a central longitudinal opening, a, we tendingentirely through its body from top to bottom and threaded throughout itsextent, as and for the purpose specified.

ROBERT G. BROWN.

Witnesses:

A. S. FITCH, A. G. N. VERMILYA.

